In the Richmond, VA area there are two promoters, using two locations. The 'oldest' -- the one at the Fairgrounds (now the Richmond Raceway Complex) put a bunch of prior restrictions on the exhibitors (essentially non compete clauses) presumed to hold their monopoly.
Praise Sam Adams! Competition works. Their arrogance caused the vendors to disappear and a different promoter found a bigger and better arena, which (big news here!) draws more vendors, making the attendance higher, which draws more vendors ... etc. The old one withers, but it's mostly a Civil War exposition, and Richmond will never forget the Northern War of Aggression. (Local joke -- Monument Avenue, which has many statues of Confederate Generals and heroes is reputed to be the largest collection of Second Place Trophies in America) ... the natives don't laugh at that.
There are a couple of local shops that I will use as first choice if they aren't too overpriced. But one of them is too big to be bothered with special orders or checking with their suppliers ('we might have some on order, I don't know for sure') to handle products they don't normally stock. Now a firearm purchase is non-trivial to me, and I don't want to subjected to a take-it-or-leave-it attitude from a kid who only shaves on Sundays.
The vendors at the (new, big) show run the gamut from one-shot individuals (just exploiting that loophole to arm al-Quaeda with their old worn-out JC Higgins 16 gauge), to the larger traveling vendors who live on the road 45 weeks a year.
Yep, you can see an occasional NFA Type III display with commensurate price tags, but usually the biggest and baddest items are de-mil'd props (you know, like in da movies, Senator). Now a few years ago, the PC crowd used a d*mn BatMan comic book to stampede a one-gun-a-month law onto the books (which didn't push Doug Wilder onto the national political scene like he'd hoped), about as effective at stopping DC criminals as you'd expect. Earlier, at a couple of shows I actually bought more than one gun (gasp!). Closed that loophole. DC is a paradise now, yessir!
So yeah, the gun shows are worth it (one of them, 5 times a year) for me to actually see and compare various guns and such, as well as ogle the odd English double or get a close look at a Wilson Combat 1911.
Bargains? Sometimes. But some of these pieces can't be had at all in the local market (and I'm not picking on the local merchants, they stock what sells -- according to their sales history), so if it's a fair value, I'll buy at the show (wallet permitting).
The shows are a marvelous example of capitalism in action, which is why the socialists are so upset. Unrestrained (no sales tax either) sale of one's personal property - this loophole is a threat to the all-seeing all-taxing gummint. The other guys with the licenses, well they have Brady to deal with.
I attend the shows because it causes Chuck Schumer's knickers to get wadded up, even if I don't buy anything. That's a good reason, to start with.